diff --git a/build.gradle b/build.gradle
index a86e5fc..3d756af 100644
--- a/build.gradle
+++ b/build.gradle
@@ -39,7 +39,7 @@ subprojects {
 		ext.maven_name='AtPlug test harness'
 		dependencies {
 			compileOnly "org.junit.jupiter:junit-jupiter-api:5.11.2"
-			implementation "org.jetbrains.kotlin:kotlin-reflect:2.0.20"
+			implementation "org.jetbrains.kotlin:kotlin-reflect:2.0.21"
 			implementation project(':atplug-runtime')
 		}
 	} else if (it.name == 'atplug-plugin-gradle') {
diff --git a/settings.gradle b/settings.gradle
index 55dd926..daf6932 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -20,11 +20,11 @@ plugins {
 	// https://plugins.gradle.org/plugin/org.jetbrains.dokka
 	id 'org.jetbrains.dokka'                       version '1.9.20' apply false
 	// https://plugins.gradle.org/plugin/org.jetbrains.kotlin.jvm
-	id 'org.jetbrains.kotlin.jvm'                  version '2.0.20' apply false
+	id 'org.jetbrains.kotlin.jvm'                  version '2.0.21' apply false
 	// https://plugins.gradle.org/plugin/org.jetbrains.kotlin.plugin.serialization
-	id 'org.jetbrains.kotlin.plugin.serialization' version '2.0.20' apply false
+	id 'org.jetbrains.kotlin.plugin.serialization' version '2.0.21' apply false
 	// https://plugins.gradle.org/plugin/org.jetbrains.kotlin.multiplatform
-	id 'org.jetbrains.kotlin.multiplatform' version '2.0.20' apply false
+	id 'org.jetbrains.kotlin.multiplatform' version '2.0.21' apply false
 	// https://github.com/adamko-dev/dokkatoo/releases
 	id 'dev.adamko.dokkatoo-html' version '2.3.1' apply false
 }